Allen&Heath iDR-8 - Manual (Page 33)

iDR-8 User Guide 33
Loop back system
This example shows two units
connected with the audio bus looped back from the last to the
first. This means that all inputs are available to both units using
the patchbays and matrix. Note that each unit must have its
own session of iDR System Manager running for configuration.
The loop back system uses the audio expander ports. In this
configuration these are no longer available for plugging in the
iDR-in and iDR-out expanders.
Force sync master Because it is not obvious to the
looped units which is the audio sync master, you need to
manually assign one of the units to be the master. If this is not
done then the operation of the units is unpredictable. Do this
from within the iDR System Manager session for the unit you
want to be the master, usually the first in the chain. Open the
File menu, Preferences, Synchronisation Options window. Tick
the Force Sync Master item.
To avoid feedback oscillation make sure you do not
route any output back to itself. Plan carefully how you will
use the input and output source patchbays and routing
matrix. Make sure all your patches are created to avoid
feedback problems.
ext
sync
lock slave 96k
ext
sync
lock slave 96k
FORCE SYNC MASTER
SYNC SLAVE
IN OUT
iDR Unit A 8A 7A 6A 5A 4A 3A 2A 1A
8 7 6 5 4 3 2 1
IN
OUT
IN OUT
iDR Unit B 8B 7B 6B 5B 4B 3B 2B 1B
8 7 6 5 4 3 2 1
IN
OUT